This guy is right, except the last part is 2.64/6.02=0.44mol(Original post by ciawhobat)
The density or chemical composition of sand has nothing to do with it. All the OP needs basically is the number of sand grains, expressed in moles (which is just a unit really - you can have moles of anything, remember).
Total volume of sand
= 3.3 * 10^13 m3
= 3.3 * 10^22 mm3
each grain is 1/8 of a mm3 (0.5mm side length - would take 8 such blocks to make a cube of 1mm side length)
so, the above figure * 8 = 2.64 * 10^23
or we could say that here our units are not mm3 but 0.5mm3, see?
So there are 2.64 * 10^23 grains of sand there.
1 mole = roughly 6 * 10^23
wow, look, we're already at the same order of magnitude! What a coincidence.
6/2.64 = 2.27 moles of sand-grains in that desert.
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how much sand in a desert watch
- 11-02-2010 15:57
(Original post by Mr. Orange)
- 11-02-2010 16:04
Ok then, kindly compare the amount of sand in the Antarctic to that of the Sahara
(Original post by LearningMath)
- 11-02-2010 16:06
This guy is right, except the last part is 2.64/6.02=0.44mol
- 11-02-2010 16:08
i'm scared the QI sirens will go off if i attempt to answer
(Original post by kerry3788)
- 11-02-2010 16:24
oo - whos got the right answer, then, its close? i duno th answer, thats why i asked 4 help. lol
- Thread Starter
- 17-02-2010 22:44
ta 4 help anyway, i get confusd with calculations